src/de/steamwar/bungeecore/inventory/SWInventory.java

@@ -122,7 +122,7 @@ public class SWInventory {
     }
 
     public void open() {
-        InventoryPacket inv = new InventoryPacket(title, SteamwarUser.get(player).getId(), size, map(itemMap, (integer, swItem) -> swItem.writeToString(integer).getAsString()));
+        InventoryPacket inv = new InventoryPacket(title, SteamwarUser.get(player).getId(), size, map(itemMap, (integer, swItem) -> swItem.writeToString(integer).toString()));
         NetworkSender.send(player, inv);
     }